Ortho-McNeil officials say the patch releases up to 60 percent more estrogen into your body than birth control pills do.
Health experts say all that estrogen can put you at a greater risk for blood clots, heart attacks and strokes.
You're especially at risk if you smoke, or if you're over the age of 35. The patch is a fairly new method of birth control that came out about three years ago.
"I would say the pill is still the most popular form, followed by the Depo Provera, the every three months shot," said Marie Marrier, a nurse practitioner with Family Planning Health Services in Wausau.
The patch is applied to the skin once a week for three weeks, with the fourth week designated for your menstrual cycle.
Marrier says women who use the patch or are thinking about using it should heed the warning, but they shouldn't panic. She says the company is only issuing a warning about the product and not a recall. If you're truly concerned, call your doctor.